<template>
  <div>
    <router-link to="/" class="header-abs"
    v-show="showAbs">
      <div class="iconfont header-abs-back">&#xe624;</div>
    </router-link>
    <div class="header-fixed"  v-show="!showAbs"
    :style="opacityStyle">
      <router-link to="/">
        <div class="iconfont header-fixed-back">&#xe624;</div>
      </router-link>
      景点详情
    </div>
  </div>
</template>
<script>
export default {
  nameL: "DetailHeader",
  data(){
      return{
          showAbs:true,
          opacityStyle:{
              opacity:0
          }
      }
  },
  methods:{
      handleScroll(){
         const top=document.documentElement.scrollTop||
         document.body.scrollTop||window.pageYOffset
         if(top>60&&top<260){
             const opacity=top/140
             this.opacityStyle={
                 opacity
             }
             this.showAbs=false
         }else{
             this.showAbs=true
         }
      }
  },
  mounted() {
      window.addEventListener('scroll',this.handleScroll)
  },
  destroyed(){
;      window.removeEventListener('scroll',this.handleScroll)
  }
};
</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl';
.header-abs {
  position: absolute;
  left: 0.2rem;
  top: 0.2rem;
  width: 0.8rem;
  height: 0.8rem;
  line-height: 0.8rem;
  border-radius: 0.4rem;
  text-align: center;
  background: rgba(0, 0, 0, 0.8);

  .header-abs-back {
    color: #fff;
    font-size: 0.4rem;
  }
}

.header-fixed {
  z-index: 2;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
   height: .86rem
    line-height: .86rem
  text-align: center;
  color: #fff;
  background: $bgColor;
  font-size: 0.32rem;

  .header-fixed-back {
    position: absolute;
    top: 0;
    left: 0;
    width: 0.64rem;
    text-align: center;
    font-size: 0.4rem;
    color: #fff;
  }
}
</style>